The CBOE Russell 2000 Volatility IndexSM (RVXSM) is a key measure of market expectations of near-term volatility conveyed by Russell 2000® stock index option prices. It measures the market’s expectation of 30-day volatility implicit in the prices of near-term Russell 2000 options. RVX is quoted in percentage points, just like the standard deviation of a rate of return, e.g. 19.36. CBOE disseminates the RVX index value continuously during trading hours. The RVX Index is a leading barometer of investor sentiment and market volatility relating to the Russell 2000 Index.

SKEWX-I description CBOE Volatility EOD Skew

The CBOE Skew Index attempts to measure tail risks — the probability of a sharp decline of two or more standard deviations on a 30-day log return basis — of the S&P 500. The index is derived from the prices of S&P 500 options, which are also used to calculate the widely quoted VIX index, which tracks volatility.

The CBOE Skew IndexSM – referred to as “SKEW” – is an option-based indicator that
measures the perceived tail risk of the distribution of S&P 500® log returns at a 30-
day horizon. Tail risk is the risk associated with an increase in the probability of
outlier returns, returns two or more standard deviations below the mean. Think stock
market crash, or black swan. This probability is negligible for a normal distribution,
but can be significant for distributions which are skewed and have fat tails.

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